Hydrogenation of levulinic acid into gamma-valerolactone over in situ reduced CuAg bimetallic catalyst: Strategy and mechanism of preventing Cu leaching
发布时间：2019-03-11
点击次数：
- 论文类型：
- 期刊论文
- 发表时间：
- 2018-09-15
- 发表刊物：
- APPLIED CATALYSIS B-ENVIRONMENTAL
- 收录刊物：
- EI、SCIE
- 文献类型：
- J
- 卷号：
- 232
- 页面范围：
- 1-10
- ISSN号：
- 0926-3373
- 关键字：
- Levulinic acid; gamma-Valerolactone; CuAg/Al2O3 catalyst; Metal leaching; In situ reduction
- 摘要：
- Metal leaching is a major issue in efficient production of gamma-valerolactone (GVL) from levulinic acid (LA) under mild reaction conditions. In this study, Ag was added to Cu-supported gamma-Al2O3 catalyst to suppress Cu leaching in the hydrogenation of LA into GVL. The CuAg/Al2O3 catalyst was reduced in situ during the reaction, and Cu leaching in the solution was significantly suppressed. The bimetallic catalyst without reduction pretreatment achieved approximately 100% yield to GVL and exhibited good reusability in nine consecutive cycles under mild reaction conditions of 180 degrees C and 1.4 MPa H-2 pressure in tetrahydrofuran (THF). The strong interplay in the geometric and electronic effects between Cu and Ag was verified through XPS, H-2-TPR, TEM, STEM/EDS, and XRD analyses. This paper extensively discussed the mechanism of Ag on preventing Cu leaching and the superiority of in situ reduction in solution over external reduction in gas.
- 第一作者
- Zhang, Li
- 合写作者
- Zhou, Jinxia,Guo, Xinwen,Song, Chunshan,Li, Shenmin,Yin, Jingmei,Sun, Xudong,Mao, Jingbo
- 通讯作者
- Song, CS; Zhou, JX (reprint author), Dalian Univ, Coll Environm & Chem Engn, Dalian 116622, Peoples R China.